feat: add fake session adapter

packages/session/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "@devflow/session",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "scripts": {
+    "build": "tsup src/index.ts --format esm,cjs --clean && tsc -p tsconfig.build.json",
+    "typecheck": "tsc -p ../../tsconfig.typecheck.json --noEmit",
+    "test": "vitest run"
+  },
+  "dependencies": {
+    "@devflow/core": "workspace:*"
+  }
+}